Quantum Corporation Annual report [Section 13 and 15(d), not S-K Item 405]

Annual report [Section 13 and 15(d), not S-K Item 405]

COMMON STOCK - Narrative (Details)

COMMON STOCK - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands									3 Months Ended	12 Months Ended
	Dec. 16, 2025	Sep. 23, 2025	Jan. 25, 2025	Jan. 03, 2025	Dec. 30, 2024	Aug. 15, 2024	Dec. 30, 2022	Feb. 01, 2021	Mar. 31, 2026	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Dec. 29, 2022	Apr. 02, 2022	Jun. 30, 2020
Share-based compensation expense:
Common stock, shares authorized (in shares)									225,000,000	225,000,000	225,000,000			225,000,000		125,000,000
Warrant liabilities									$ 14,105	$ 14,105	$ 0
Percentage ownership necessary to request filing with sec									40.00%
Standby Equity Purchase Agreement
Share-based compensation expense:
Shares authorized for issuance			$ 200,000
Sale of stock, term			3 years
Sale of stock maximum number of shares issuable (in shares)			1,157,139
Sale of stock maximum percentage			19.99%
Sale of stock beneficial ownership relationship limitation percentage			4.99%
Cumulative shares issued (shares)									8,700,000	8,700,000
Cumulative shares issued									$ 91,000	$ 91,000
Number of shares issued in transaction (in shares)										7,600,000
Proceeds from the sales of stock										$ 75,200
June 2020 Warrants \| Advisor
Share-based compensation expense:
Warrant exercise price (in dollars per share)																	$ 60.00
Class of warrant or right, additional warrants issued (in shares)																	2,500
June 2023 Warrants \| Advisor
Share-based compensation expense:
Warrant exercise price (in dollars per share)													$ 20.00
Class of warrant or right, additional warrants issued (in shares)													2,500
Amended and Restated Warrants
Share-based compensation expense:
Cashless warrants exercised (in shares)				677,905	467,248
Warrants callable (in shares)				228,195	61,270
Warrant exercise price (in dollars per share)				$ 35.42	$ 6.20
Number shares under warrant(s) (in shares)				449,710	405,978
Forbearance Warrant
Share-based compensation expense:
Warrants callable (in shares)		2,653,308
Warrant liabilities		$ 20,000
Restricted stock units
Share-based compensation expense:
Vesting period										3 years
Granted (in shares)										370,905	312,250
Unrecognized compensation cost related to stock options granted									$ 2,800	$ 2,800
Weighted-average period for recognition (in years)										1 year 8 months 12 days
Awards granted, fair value										$ 2,600	$ 3,800
Employee stock purchase plan
Share-based compensation expense:
Shares available for future equity grants (in shares)									204,400	204,400	204,400	4,400
Common stock purchase price, percentage										85.00%
Performance share units
Share-based compensation expense:
Granted (in shares)										120,000	180,126
Unrecognized compensation cost related to stock options granted									$ 700	$ 700
Weighted-average period for recognition (in years)										1 year 7 months 6 days
Awards granted, fair value										$ 700	$ 400
Forbearance Warrant
Share-based compensation expense:
Warrant exercise price (in dollars per share)		$ 8.81
Class of warrant or right, exercise price of warrants or rights percentage		80.00%
Number of days volume weighted average price		7 days
2021 Inducement Plan
Share-based compensation expense:
Common stock, shares authorized (in shares)							100,000
Additional shares authorized during period (in shares)							200,000
Shares authorized (in shares)									100,000	100,000					38,500
2021 Inducement Plan \| Stock options
Share-based compensation expense:
Plan term								7 years
2021 Inducement Plan \| Stock options \| Minimum
Share-based compensation expense:
Vesting period								2 years
2021 Inducement Plan \| Stock options \| Maximum
Share-based compensation expense:
Vesting period								3 years
2021 Inducement Plan \| Restricted stock units
Share-based compensation expense:
Plan term								7 years
2021 Inducement Plan \| Restricted stock units \| Minimum
Share-based compensation expense:
Vesting period								2 years
2021 Inducement Plan \| Restricted stock units \| Maximum
Share-based compensation expense:
Vesting period								3 years
2023 Long Term Incentive Plan
Share-based compensation expense:
Additional shares authorized during period (in shares)	1,400,000					250,000
Plan term								7 years
Shares authorized (in shares)									2,200,000	2,200,000
Share-based payment award, options, outstanding, number (in shares)									100,000	100,000
Shares available for future equity grants (in shares)									1,600,000	1,600,000
2023 Long Term Incentive Plan \| Stock options \| Minimum
Share-based compensation expense:
Vesting period								1 year
2023 Long Term Incentive Plan \| Stock options \| Maximum
Share-based compensation expense:
Vesting period								4 years
2023 Long Term Incentive Plan \| Performance share units
Share-based compensation expense:
Shares outstanding (in shares)									500,000	500,000
2023 Long Term Incentive Plan \| Performance share units \| Minimum
Share-based compensation expense:
Vesting period								1 year
2023 Long Term Incentive Plan \| Restricted Stock
Share-based compensation expense:
Shares outstanding (in shares)									500,000	500,000
2023 Long Term Incentive Plan \| Restricted Stock \| Minimum
Share-based compensation expense:
Vesting period								1 year